---------- Forwarded message ---------- From: Shankara Pailoor <sp3485@xxxxxxxxxxxx> Date: Tue, Oct 31, 2017 at 10:05 PM Subject: Fwd: KASAN: use-after-free in move_expired_inodes To: Andrew Zhu Aday <andrew.aday@xxxxxxxxxxxx> ---------- Forwarded message ---------- From: Shankara Pailoor <sp3485@xxxxxxxxxxxx> Date: Tue, Oct 31, 2017 at 10:04 PM Subject: Re: KASAN: use-after-free in move_expired_inodes To: LKML <linux-kernel@xxxxxxxxxxxxxxx>, viro@xxxxxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx Hi Al, etc, I was unable to find a reproducer but I was looking at move_expired_inodes (fs/fs-writeback.c 1093.c) and how do you ensure that the inode can't be freed after retrieving it from the work queue? Any insights would be appreciated. Regards, Shankara On Tue, Oct 31, 2017 at 9:24 AM, Shankara Pailoor <sp3485@xxxxxxxxxxxx> wrote: > Hi, > > We got the following error: > > BUG: KASAN: use-after-free in move_expired_inodes+0xce6/0xdf0 > Write of size 8 at addr ffff8800a3a36bf8 by task kworker/u8:0/5 > > while fuzzing with Syzkaller on 4.14-rc4 on x86_64. Included is the > trace of the crash along with the programs running around the time of > the crash. > > Programs can be found here: https://pastebin.com/RYGtNn3z > > Stack trace here: https://pastebin.com/SaJXWMg3 > > We don't have a C reproducer but we will send one if we have it. > > Regards, > Shankara
